Don't crash when there's a certificate mismatch and after saving the cert, before choosing to persist it, the page gets redirected; also, don't repeat the "Certificate mismatch" after the first yes, if there's a redirect. Now when the user accept a certificate, is treated as temporary saved for the whole session.

* hide-pre-context: if nonzero hide the start and end line of a pre block (i.e. ```). Defaults to zero. * add: hide-pre-blocks: if nonzero hide by default the body of a pre block; push-button can be used to toggle visibility per-block. Defaults to zero.

the *last* level 2 or 3 heading would be used as tab title instead of the first one.

i.e. trasform XYZ bytes to something readable

Allow `colorN' and `colourN' (where 0 <= N < 256) as color specifier.